Past Simple/Past Continuous/Past Perfect

Last week, I __________ (run) into an ex-girlfriend of mine.

When I _______ (arrive) home last night, I discovered that Jane _______ (prepare) a beautiful candle-lit dinner. 

We ________ (clean) the windows and the car on Saturday morning. 

She couldn't play yesterday because she _______ (sprain) her ankle the day before. 

We entered the house quietly because everyone _______ (sleep).

Why _______ she still _______ (work) at one o’clock in the morning?

I was happy to see her, because we _______ (not see) each other for years.

What are typical signal words for the Simple Past?

Whe I arrived, the lecture had already started and the professor _______(write) on the overhead projector.

There _______ (be) many fish in the river.

I _______ (go) to a movie last night, but I _______ (enjot / not) it.

The children _______ (go) to bed a half an hour ago. They _______ (sleep) all that night.